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ALDL Datalogging

Looks like this program was written specifically for a 1994 1/2 ton model with the L05 engine (5.7L V8 TBI, VIN=K) and 4L60E transmission but it doesn't look like it would be that difficult to add definitions for any other GM vehicle with 8192 baud data stream.

it's 'driverless' so instead of using linux's serial driver, it accesses your raw FTDI usb device and does all the heavy lifting itself, meaning it can not only set arbitrary baud rates but nail down perfect serial timing. lots of people have written definitions for other vehicles for it too (it's more for hacky linux-based dashboards, has an ncurses interface and logs to CSV full time)

alternatively you can run tunerpro in a windows virtual machine with a usb interface, done that a few times works just great if you want to

it's 'driverless' so instead of using linux's serial driver, it accesses your raw FTDI usb device and does all the heavy lifting itself, meaning it can not only set arbitrary baud rates but nail down perfect serial timing. lots of people have written definitions for other vehicles for it too (it's more for hacky linux-based dashboards, has an ncurses interface and logs to CSV full time)

I actually tried that one first, I haven't been able to get the ftdi_sio driver to successfully rmmod or blacklist. Though this was from a raspi using a TTL-234X cable with wired ends connecting directly to the ALDL, I'll attempt again later today via laptop and see if I get better results.

ALDL Scan Tool is a pretty trouble free app for android. Android is Linux too. The only problem I have is If I hit the data stream too fast after it connects it freezes the phone. Wait ten seconds and it golden.